kou commented on issue #44478:
URL: https://github.com/apache/arrow/issues/44478#issuecomment-2424896157
Ah, we need to prevent `Arrow::ExtensionType.new`:
```diff
diff --git a/c_glib/arrow-glib/basic-data-type.cpp
b/c_glib/arrow-glib/basic-data-type.cpp
index d1c0600006..dff9725150 100644
--- a/c_glib/arrow-glib/basic-data-type.cpp
+++ b/c_glib/arrow-glib/basic-data-type.cpp
@@ -1660,9 +1660,9 @@ enum {
PROP_STORAGE_DATA_TYPE = 1
};
-G_DEFINE_TYPE_WITH_PRIVATE(GArrowExtensionDataType,
- garrow_extension_data_type,
- GARROW_TYPE_DATA_TYPE)
+G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE(GArrowExtensionDataType,
+ garrow_extension_data_type,
+ GARROW_TYPE_DATA_TYPE)
#define GARROW_EXTENSION_DATA_TYPE_GET_PRIVATE(obj)
\
static_cast<GArrowExtensionDataTypePrivate *>(
\
```
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